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This paper presents a new method for calculating optical flow using data from a high frame-rate camera. We focused on a feature of image data captured with a high frame-rate camera in which objects do not move more than one pixel between successive frames. This approach eliminates repetitive processing for object identification among frames taken at different sampling times. High-speed processing hardware architecture was designed with sequential processing only, and the algorithm was implemented in a field programmable gate array. The resultant unit can calculate optical flow for a 640×120 pixel size image with a 480-Hz processing cycle and 0.5-μsec processing latency.

New vapor deposited zinc alloy coatings, which are Zn-Mg, Zn-Al, Zn-Cr, Zn-Ni and Zn-Ti coatings, have been developed by vapor deposition pilot-line. Morphology of surface structure, depth profile of alloy composition and crystal structure have been studied for these coatings. Zn-Mg alloy coated steel sheet showed the best corrosion resistance. The corrosion behavior of this coating has been investigted. The coating surface is densely covered with a corrosion product layer composed of ZnC12·4Zn(OH)2, which could play a role as a protective barrier film. The corrosion potential remains active enough to give the substrate galvanic protection for a long time in a corrosive environment. Attention has been directed to corrosion resistance for automobile body panels in recent years and several types of zinc coated steel sheets has been developed for automotive usage.